﻿// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// Copyright (c) 2011, Dr. Masroor Ehsan
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the author nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
// $Author: masroore@gmail.com $
// $Id: Contract.cs 37 2011-10-21 15:00:21Z masroore@gmail.com $
// $Rev: 37 $
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

using System;
using CuttingEdge.Conditions;

namespace MaxTrader.BusinessObjects
{
    public sealed class Contract : Entity, ICommentable
    {
        /// <summary>
        ///   Initializes a new instance of the Contract class.
        /// </summary>
        public Contract(ContractBuilder builder)
        {
            Condition.Requires(builder, "builder").IsNotNull();
            Condition.Requires(builder.price, "price").IsGreaterThan(0);
            Condition.Requires(builder.quantity, "quantity").IsGreaterThan(0);

            Type = builder.type;
            Stock = builder.stock;
            Date = builder.date;
            Quantity = builder.quantity;
            Price = builder.price;
            Total = builder.quantity*builder.price;

            ReferenceDate = builder.referenceDate;
            ReferencePrice = builder.referencePrice;
            ReferenceTotal = (ReferencePrice == null) ? null : ReferencePrice*Quantity;
        }

        public ContractType Type { get; protected set; }

        public Stock Stock { get; protected set; }

        public DateTime Date { get; protected set; }

        public decimal Quantity { get; protected set; }

        public decimal Price { get; protected set; }

        public decimal Total { get; private set; }

        // Reference price for the contract. Only for selling type contract usage.
        // It means cost for owning a stock.
        public decimal? ReferencePrice { get; protected set; }

        public DateTime? ReferenceDate { get; protected set; }

        public decimal? ReferenceTotal { get; private set; }

        #region ICommentable Members

        public string Comment { get; set; }

        #endregion

        /// <summary>
        ///   Derives a contract with new quantity from this contract.
        /// </summary>
        /// <param name = "newQuantity">The new quantity</param>
        public Contract DeriveWithQuantity(decimal newQuantity)
        {
            Condition.Requires(newQuantity, "newQuantity").IsGreaterThan(0);

            var builder = new ContractBuilder(Stock, Date);
            return builder
                .Quantity(newQuantity)
                .Price(Price)
                .ReferencePrice(ReferencePrice)
                .ReferenceDate(ReferenceDate)
                .Build();
        }

        /// <summary>
        ///   Derives a contract with new price from this contract.
        /// </summary>
        /// <param name = "newPrice">The new quantity</param>
        public Contract DeriveWithPrice(decimal newPrice)
        {
            Condition.Requires(newPrice, "newPrice").IsGreaterThan(0);

            var builder = new ContractBuilder(Stock, Date);
            return builder
                .Price(newPrice)
                .Quantity(Quantity)
                .ReferencePrice(ReferencePrice)
                .ReferenceDate(ReferenceDate)
                .Build();
        }
    }
}